\begin{tabular}{lcccc} \hline
 & (1) & (2) & (3) & (4) \\
VARIABLES & Orig. EI & New EI & Orig. SI & New SI \\ \hline
 &  &  &  &  \\
PGI EA & 0.0243 & 0.0173 & -0.133*** & -0.153*** \\
 & (0.0345) & (0.0346) & (0.0378) & (0.0366) \\
Sex of twin & -0.172*** & -0.108** & -0.119** & 0.0397 \\
 & (0.0489) & (0.0488) & (0.0512) & (0.0491) \\
Constant & 0.0542** & 0.00398 & 0.0246 & -0.0834*** \\
 & (0.0257) & (0.0256) & (0.0269) & (0.0258) \\
 &  &  &  &  \\
Observations & 2,526 & 2,526 & 2,526 & 2,526 \\
R-squared & 0.636 & 0.644 & 0.624 & 0.638 \\
 Twin pair FE & YES & YES & YES & YES \\ \hline
\multicolumn{5}{c}{ Robust standard errors in parentheses} \\
\multicolumn{5}{c}{ *** p$<$0.01, ** p$<$0.05, * p$<$0.1} \\
\end{tabular}
